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Am. Jour. Sci., Vol. XXI, 1906.
Plate II.
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Fig. 1. Elasmosaurus ischiadicus Williston.
Fig. 2. Elasmosaurus(?) marshii Williston.
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Fig. 1. Elasmosaurus ischiadicus Williston.
Fig. 2. Elasmosaurus(?) marshii Williston.
